# CVE-2026-27579: Misconfiguration in realtime-collaboration-platform

> Misconfigured CORS settings in CollabPlatform allow attackers to read sensitive user account data via authenticated cross-origin requests.

- **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 21 Feb 2026
- **Updated:** 24 Feb 2026

## What is CVE-2026-27579?

CVE-2026-27579 is a high-severity vulnerability in karnop realtime-collaboration-platform, published on 21 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

CollabPlatform is a full-stack, real-time doc collaboration platform. In all versions of CollabPlatform, the Appwrite project used by the application is misconfigured to allow arbitrary origins in CORS responses while also permitting credentialed requests. An attacker-controlled domain can issue authenticated cross-origin requests and read sensitive user account information, including email address, account identifiers, and MFA status. The issue did not have a fix at the time of publication.

Weakness: CWE-942 (Permissive Cross-domain Security Policy with Untrusted Domains), CWE-346 (Origin Validation Error)

## Which versions are affected by CVE-2026-27579?


## How do I fix CVE-2026-27579?

No fix has been published for CVE-2026-27579 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27579 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27579 exists.

Public exploit code:

- CVE-2026-27579 - CORS Misconfiguration – Arbitrary Origin with Credentials → Authenticated Cross-Origin Account Data Exposure (github_poc): https://github.com/AdityaBhatt3010/CVE-2026-27579-CORS-Misconfiguration-Leading-to-Authenticated-Data-Exposure
- https://github.com/mbanyamer/CVE-2026-27579-CollabPlatform-Appwrite-CORS-Misconfiguration (github_poc): https://github.com/mbanyamer/CVE-2026-27579-CollabPlatform-Appwrite-CORS-Misconfiguration

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27579 and fix it if it is affected.

What it is: CVE-2026-27579 is a high-severity vulnerability in karnop realtime-collaboration-platform, published on 21 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27579 exists.

Affected product: karnop realtime-collaboration-platform. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-27579/ (Markdown: https://insights.sbomify.com/CVE-2026-27579/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27579
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27579
- OSV: https://osv.dev/vulnerability/CVE-2026-27579

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-27579/
Summaries are generated and may contain mistakes; the official description above is the record.